What does a=b mean in c++

The meaning of a=b in C is to assign the value of variable b to variable a. It works by copying the contents of b into a and changes to one of the variables will be reflected in the other. Things to note include: only assigning values ​​of compatible types, assignment operators being right-associative, returning the left operand, and allowing chained assignments.

The meaning of a=b in C

In the C programming language, a=b is the assignment operator . It assigns the value of variable b to variable a.

Syntax:

<code class="cpp">a = b;</code>

where a and b are valid C variables.

Working principle:

The assignment operator copies the contents of the b variable to the a variable. This does not create a new copy of b, instead it assigns a reference to the same block of memory to a. This means that any changes to a or b will be reflected in the other variable.

Example:

<code class="cpp">int a, b;
a = 10;
b = 20;
a = b; // 现在 a 和 b 都包含值 20</code>

Result:

In this example, both variables a and b now contain the value 20. Any changes to b will be reflected in a and vice versa.

Things to note:

• The assignment operator can only assign values ​​of compatible types to variables. For example, a value of type integer cannot be assigned to type string.
• Assignment operators are right associative, which means they are evaluated from right to left.
• The assignment operator returns its left operand, which allows chained assignments. For example, a = b = c assigns the value of b to a and b.
• The assignment operator replaces the existing value of the a variable.

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